Hi,
yesterday the hybrid backup on one of our customer's exchange server ended with this error message. However, we have only two backup plans on this system. One hybrid backup plan for the Exchange server which is executed daily, and one image based backup which is only stored locally on our Backup-NAS. Therefore I do not understand how a conflict could rise.
I recommend you open a Support case for instructions on how you may be able to address that issue. The Support team would need to review the logs and version of the software.